This is a router that can connect two Ethernet interfaces, implement three ways to obtain WAN IP addresses, and act as a DHCP server on the LAN side. It can also implement virtual servers and firewalls.
This manual introduces the ESG-103 broadband router, describing its key features such as NAT firewall, DHCP server, virtual server, and three methods for acquiring a WAN IP address. It also explains the hardware components included in the package and the back‑panel connectors.
The guide walks users through hardware installation, web‑based configuration, firmware upgrades, and advanced settings like DNS, DHCP, and NAT/DMZ. Appendices cover TCP/IP configuration for various Windows versions and additional reference information.
Firmware can be upgraded via a web browser or by using a TFTP client.